Body Position positioning me to somewhere random?

I do not know the issue. But whenever the BP is used it just positions me to somewhere random? Its supposed to be a jump, and holds the player in air while a projectile fires. (A jump kind of effect into the air) I don't know the problem, but I have attached my script to this thread. Please help!

-- Variables
local UIS = game:GetService("UserInputService")
local Cam = script:WaitForChild("CamShake")
local ButtonEvent = script:WaitForChild("BtnDown")
local plr = game.Players.LocalPlayer
local Mouse = plr:GetMouse()
local Debounce = true
local BtnDown = false
Player = game.Players.LocalPlayer
Char = Player.Character

--- Functions:
local Tool = script.Parent

Tool.Equipped:Connect(function()
    Tool.Equip.Value = true
end)

Tool.Unequipped:Connect(function()
    Tool.Equip.Value = false
end)

--- Keybind
UIS.InputBegan:Connect(function(Input)
    if Input.KeyCode == Enum.KeyCode.Z and Debounce == true then
        Debounce = false --and Tool.Equip.Value == true and Tool.Active.Value == "None" then
        BtnDown = true
        --Tool.Active.Value = "WindSlam"

        local Charge = 0
        script.Function:FireServer(Mouse.Hit.p)

        local BG = Instance.new("BodyGyro")
        BG.Parent = Char.HumanoidRootPart
        BG.MaxTorque = Vector3.new(250000,250000,250000)
        BG.CFrame = CFrame.new(Char.HumanoidRootPart.Position, Mouse.Hit.p)
        BG.P = 25000
        BG.D = 140

        local BP = Instance.new("BodyPosition")
        BP.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
        BP.P = 15000
        BP.D = 1250
        BP.Position = Char.HumanoidRootPart.Position
        BP.Parent = Char.HumanoidRootPart

        while BtnDown == true and Charge < 40 do
            BG.CFrame = CFrame.new(Char.HumanoidRootPart.Position, Mouse.Hit.p)
            Charge = Charge + 1
            wait()
        end
        BG:Destroy()
        BP:Destroy()
        ButtonEvent:FireServer()
    end
end)

UIS.InputBegan:Connect(function(Input)
    if Input.KeyCode == Enum.KeyCode.Z and Tool.Equip.Value == true and Tool.Active.Value == "None" then
        BtnDown = false
        Tool.Active.Value = "WindSlam"
        wait(1.5)

        Tool.Active.Value = "None"

        wait(3)
        Debounce = true
    end
end)

-- Camera Shake

function cameraShake()
    local Character = Player.Character
    local Humanoid = Character:WaitForChild("Humanoid")

    for i = 1, 40 do
        local a = math.random(-100, 100)/100
        local b = math.random(-50, 50)/100
        local c = math.random(-100, 100)/100

        Humanoid.CameraOffset = Vector3.new(a,b,c)
        wait()
    end
    Humanoid.CameraOffset = Vector3.new(0,0,0)  
end

Cam.OnClientEvent:Connect(function()
    cameraShake()
end)